feat: drag and drop

src/app/components/chess-piece/chess-piece.component.ts

@@ -1,4 +1,4 @@
-import { Component, Input } from '@angular/core';
+import { Component, EventEmitter, Input, Output } from '@angular/core';
 
 @Component({
   selector: 'app-chess-piece',
@@ -8,6 +8,22 @@ import { Component, Input } from '@angular/core';
 })
 export class ChessPieceComponent {
   @Input({ required: true }) pieceCode: string | null = null;
+  @Input() draggable = false;
+  @Output() pieceDragStart = new EventEmitter<DragEvent>();
+  @Output() pieceDragEnd = new EventEmitter<void>();
+
+  onDragStart(event: DragEvent): void {
+    if (!this.draggable) {
+      event.preventDefault();
+      return;
+    }
+
+    this.pieceDragStart.emit(event);
+  }
+
+  onDragEnd(): void {
+    this.pieceDragEnd.emit();
+  }
 
   get spriteUrl(): string {
     if (!this.pieceCode) {